Look no Further for rust removal chemicals.
I live in Florida and water my yard every morning. It used to be on city water and my water bill was up to 42,000 gallons a month at over 300$ per month. I paid several grand to dig a well a number of years ago and water daily for nothing except the price of the electricity for the well pump. Anyway the yard looks great but the sidewalk and the driveway and road were a mesh. Used to buy Rust Aide which worked great but that went into hiding several years ago...maybe 4 or so. I have tried diluted Muriac acid which was terrible and destroyed two sprayers, one a very high end back sprayer. Went to Home Depot...nothing. Searched Walmart and wanted 21$ a gallon to ship. Negative on that. The internet Walmart site said they had it and I went there to find little cans of Goof Off. I said I say them on the internet at this store!! after a wasted several hours on looked on line and for a reasonable price i got 12 gallons for under 90$. shipped and received in sev days. Works great. Kills grass big time. I have asthma and it is hell on your lungs so stay upwind of the fumes. One needs to go over the same spot sev times but my rust was big time thick of 2 years worth. I even got them a customer as I was spraying my sidewalk. "excuse me sir but is that chemical you are spraying on the rust stain?" "Yes it sure is and it works great!" proceeded to cut the label of one of the plastic gallons and give it to her. A future satisfied customer in the making! really and truly the stuff works great!
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